4-56. BRAKE LINES - REPLACE.
This Task Covers:
Tool Kit, General Mechanic's: Automotive (Appendix B, Section III, Item 1).
Brake fluid (Appendix E, Section II, Item 2).
Teflon Tape (Appendix E, Section II, Item 7).
Rags, wiping (Appendix E, Section II, Item 1).
Dry cleaning solvent (Appendix E, Section II, Item 3).
Nut, self-locking (Appendix H, Section II, Item 10).
Unit shut down and cool.
a. Removal. (Refer to Figure 4-56).
Chock wheels when unit is not on a level surface. Unit could roll and cause
Compressed air may cause severe injury or death, if not used properly.
Make sure that air pressure in trailer brake system is completely drained
Completely vent trailer air brake pressure by opening valve. (para. 4-51).
Loosen brake wheel cylinder (1) bleeder screw and bleed until emerging fluid is free of bubbles. Use a clean jar
or container to submerge free end of bleed line in the fluid.
Loosen brake line (2) at rear of brake cylinder (3) and drain brake fluid into jar or container.
Disconnect brake line (2) from wheel cylinder (3).
Disconnect brake line (2) from axle tee (4) (6) Disconnect brake line (5) from wheel cylinder (1).
Disconnect brake line (5) from axle tee (4).
Holding hydraulic hose assembly (6) end fitting, disconnect brake line (7) from hydraulic hose assembly (6).